Perennial Ryegrass is a cool-season turf grass that is known for its rapid germination and establishment, tolerance to traffic, and resistance to insects and stress. This competitive grass is also well-adapted to moderate temperatures, leading to Perennial Ryegrass being mixed with Kentucky Bluegrass for use in home lawns, schools and parks. This turf grass can be found in lawns throughout North America, though it is less common in Florida, Texas and other southern parts of the United States.